[TM-417] Allow nettests run fail once
Description
Problem: Local-chain tests are a bit flaky and may fail due to network problems that don't really indicate any bugs. Restarting them manually and getting extra notifications about failed builds can be annoying.
Solution: Allow nettest retry one time in case of failure.
Related issue(s)
https://issues.serokell.io/issue/TM-417
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If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.
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Edited by Roman Melnikov